Strangely enough, I know several old "friends" who have not gotten married in the Kingdom Hall because they think the insides are ugly (very true)......and its ok now.
in 1999 when i got married, it was "get married in the KH or else"
unwritten rules...hmmmm...well, for the Philadelphia, PA area it was:
no long sideburns
no beards (of course)
no 2 door cars (this was loosening up as I left 2 years ago)
matching pants and suit jacket to do mics (no slacks w/ different colored jacket)